Getting error at the time of xml serialization

i want to get xml after serialization as follows

    <?xml version="1.0" encoding="windows-1252"?>
    <OpenShipments xmlns="x-schema:C:\UPSLabel\OpenShipments.xdr">
    <OpenShipment ShipmentOption="" ProcessStatus="">
        <ShipTo>
            <CompanyOrName>DARMOT Sp. z o.o</CompanyOrName>
            <Attention>DARMOT Sp. z o.o</Attention>
            <Address1>Ojca Damiana Tynieckiego 46</Address1>
            <Address2></Address2>
            <Address3>DarÂ3owo</Address3>
 &nbs ...